The impact of spatially varying wetland source signatures on the atmospheric variability of δD-CH4

The impact of spatially varying wetland source signatures on the atmospheric variability of δD-CH4
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空间变化的湿地源特征对 δD-CH4 大气变化的影响

DOI:
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发表时间:
2021
期刊:
Philosophical Transactions of the Royal Society A
影响因子:
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通讯作者:
A. Ganesan
A. Ganesan
中科院分区:
--
文献类型:
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作者:
A. Stell;P. Douglas;M. Rigby;A. Ganesan

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我们首次展示了湿地甲烷排放 δD-CH4 特征的空间分辨分布,并评估了其对大气 δD-CH4 的影响。 δD-CH4 特征图是通过将各种湿地类型和位置的降水 δD-H2O 与测量的甲烷湿地排放的 δD-CH4 相关联而得出的。这导致湿地 δD-CH4 源特征存在强烈的纬度变化。当在全球大气模型中模拟 δD-CH4 时,如果使用空间变化的 δD-CH4 源特征分布而不是全球统一值,则全球平均值、半球间差异和季节周期几乎没有差异。这是因为大气中的 δD-CH4 主要受 OH 分馏控制。然而,我们表明,尽管存在这些微小差异,但使用 δD-CH4 的大气记录来推断湿地排放分布的变化需要使用更准确的空间变化 δD-CH4 源特征。我们发现,如果可以通过空间解析的源特征来利用空间信息,则模型只会对排放分布的变化敏感。此外,我们还发现,在区域尺度上,在测量 δD-CH4 相对于背景水平的偏移的地点,如果使用空间变化或统一的源特征,则模拟大气 δD-CH4 的显着差异。本文是讨论会议问题“甲烷上升:变暖正在加剧变暖吗?”的一部分。 (第 1 部分)’。
We present the first spatially resolved distribution of the δD-CH4 signature of wetland methane emissions and assess its impact on atmospheric δD-CH4. The δD-CH4 signature map is derived by relating δD-H2O of precipitation to measured δD-CH4 of methane wetland emissions at a variety of wetland types and locations. This results in strong latitudinal variation in the wetland δD-CH4 source signature. When δD-CH4 is simulated in a global atmospheric model, little difference is found in global mean, inter-hemispheric difference and seasonal cycle if the spatially varying δD-CH4 source signature distribution is used instead of a globally uniform value. This is because atmospheric δD-CH4 is largely controlled by OH fractionation. However, we show that despite these small differences, using atmospheric records of δD-CH4 to infer changes in the wetland emissions distribution requires the use of the more accurate spatially varying δD-CH4 source signature. We find that models will only be sensitive to changes in emissions distribution if spatial information can be exploited through the spatially resolved source signatures. In addition, we also find that on a regional scale, at sites measuring excursions of δD-CH4 from background levels, substantial differences are simulated in atmospheric δD-CH4 if using spatially varying or uniform source signatures. This article is part of a discussion meeting issue ‘Rising methane: is warming feeding warming? (part 1)’.
通过 3-D 反演模型对最近大气甲烷增加的归因
DOI: 10.5194/acp-2018-474
发表时间: 2018
期刊: --
影响因子: --
作者:
McNorton J
通讯作者: McNorton J
DOI: 10.5194/acp-16-12239-2016
发表时间: 2016-09
影响因子: 6.3
作者:
T. Sherwen;J. Schmidt;M. Evans;L. Carpenter;K. Grossmann;S. Eastham;D. Jacob;B. Dix;T. Koenig;R. Sinreich;I. Ortega;R. Volkamer;A. Saiz‐Lopez;C. Prados-Román;A. Mahajan;C. Ordóñez
通讯作者: T. Sherwen;J. Schmidt;M. Evans;L. Carpenter;K. Grossmann;S. Eastham;D. Jacob;B. Dix;T. Koenig;R. Sinreich;I. Ortega;R. Volkamer;A. Saiz‐Lopez;C. Prados-Román;A. Mahajan;C. Ordóñez